<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let age = 333;
        console.log(typeof age); //number

        // 1.number 转化为字符串
        age = age.toString();
        console.log(typeof age);//string

        // 2,强制转化
        let score =String(100);
        console.log(typeof score);  //string

        // 3,prompt() 接受的数据作为字符串
        let year = prompt('请写出你的出生日期');
        console.log(typeof year); //string
    </script>
</body>
</html>